### Certificate-based hybrid encryption scheme under standard model in cloud computing

ZHOU Ping1，2, HE Dake1, ZHANG Wenfang1

1. 1.College of Information Science & Technology, Southwest Jiaotong University, Chengdu 610031, China
2.Department of Information Engineering, Urban Vocational College of Sichuan, Chengdu 610101, China
• Online:2014-10-01 Published:2014-09-29

### 云计算中的标准模型下基于证书混合加密方案

1. 1.西南交通大学 信息科学与技术学院，成都 610031
2.四川城市职业学院 信息工程系，成都 610101

Abstract: With the rapid development of cloud computing, data security has become a critical problem of cloud security, at the same time, the amount of cloud data storage and transmission is very huge and the safety requirements are very high. On the other hand, certificate-based cryptosystems can overcome the certificate manage problem in traditional public key cryptosystems and the private key escrow problem in identity-based cryptosystems, so it provides new ways for constructing effective PKI. But there are pairing operations in most current certificate-based encryption schemes, so the efficiencies of those schemes are low. Based on judging truncated Diffie-Hellman problem, it presents a certificate-based hybrid encryption scheme without pairings, which efficiency has been analyzed, and security has been proved. Scheme is a one-time-one-key encryption scheme based on key encapsulation algorithm, symmetric encryption algorithm and message authentication code algorithm. Analysis shows that the scheme is efficient and can resist adaptive chosen ciphertext attack, so it can be used in cloud computing environment.